Amen Joe.
I'd like to add that because we know God's will, in that (1) He decides who is called and chosen, or (2) He has blinded the eyes of those who can't receive the truth, etc...
...sometimes when we think of certain people in our lives who are in need of prayers, we want to follow God's will, and therefore don't know HOW to pray for this person. This verse is invaluable:
Rom 8:26(CLV) Now, similarly, the spirit also is aiding our infirmity, for what we should be praying for, to accord with what must be, we are not aware, but the spirit itself is pleading for us with inarticulate groanings."
CEV version;
In certain ways we are weak, but the Spirit is here to help us. For example, when we don't know what to pray for, the Spirit prays for us in ways that cannot be put into words.
LITV version
And likewise the Spirit also joins in to help our weaknesses. For we do not know what we should pray as we ought, but the Spirit Himself intercedes on our behalf with groanings that cannot be uttered.
So, even though we are not sure what we should be praying - rather than praying something we know is against our Lord's will, just thinking of these people while we are prayer and letting the spirit do its' work will suffice.
But indeed, we should never stop praying.
Love,
Marie